package com.xzh.gulimall.cart.interceptor;

import com.xzh.common.constant.AuthServerConstant;
import com.xzh.common.constant.CartConstant;
import com.xzh.common.vo.MemberRespVo;
import com.xzh.gulimall.cart.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.thymeleaf.util.StringUtils;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/*在执行目标方法之前先判断用户登录状态，并封装传递给controller目标请求*/
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
    /*在目标方法执行之前拦截*/
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(member != null){
            //用户登陆
            userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if(cookies!=null&&cookies.length>0){
            for (Cookie cookie : cookies) {
                //user-key
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        //如果没有临时用户，一定分配一个临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String s = UUID.randomUUID().toString();
            userInfoTo.setUserKey(s);
        }
        //目标方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }

    //业务执行之后
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

        //如果没有临时用户，创建一个临时用户
       if(!threadLocal.get().isTempUser()){
           //如果没有临时用户，创建一个临时用户
           Cookie cookie = new Cookie(CartConstant.TEMP_COOKIE_NAME,threadLocal.get().getUserKey());
           cookie.setDomain("xzhmall.com");
           cookie.setMaxAge(CartConstant.TEMP_COOKIE_TIME_OUT);
           response.addCookie(cookie);
       }

    }
}
